diff --git a/CHANGELOG.md b/CHANGELOG.md
index c6154d532..1e40506b3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Bugfixes:
 * Fix `{day-pretty}` output in custom format (DateTime, Windows)
 * Fix VanillaOS detection (OS, Linux)
 * Fix secure boot testing (Bootmgr, Linux)
+* Fix the SI unit "kB" in help message
 
 Features:
 * Support Chassis module in macOS (Chassis, macOS)
diff --git a/doc/json_schema.json b/doc/json_schema.json
index 0ee8a87c1..ae1f3f9d8 100644
--- a/doc/json_schema.json
+++ b/doc/json_schema.json
@@ -786,11 +786,11 @@
                                 },
                                 {
                                     "const": "si",
-                                    "description": "1000 Bytes = 1 KB, 1000 KB = 1 MB, ..."
+                                    "description": "1000 Bytes = 1 kB, 1000 kB = 1 MB, ..."
                                 },
                                 {
                                     "const": "jedec",
-                                    "description": "1024 Bytes = 1 kB, 1024 K = 1 MB, ..."
+                                    "description": "1024 Bytes = 1 KB, 1024 KB = 1 MB, ..."
                                 }
                             ]
                         },
diff --git a/src/data/help.json b/src/data/help.json
index 35218f5ca..a4a869f5a 100644
--- a/src/data/help.json
+++ b/src/data/help.json
@@ -683,8 +683,8 @@
                 "type": "enum",
                 "enum": {
                     "IEC": "1024 Bytes = 1 KiB, 1024 KiB = 1 MiB, ...",
-                    "SI": "1000 Bytes = 1 KB, 1000 KB = 1 MB, ...",
-                    "JEDEC": "1024 Bytes = 1 kB, 1024 kB = 1 MB, ..."
+                    "SI": "1000 Bytes = 1 kB, 1000 kB = 1 MB, ...",
+                    "JEDEC": "1024 Bytes = 1 KB, 1024 KB = 1 MB, ..."
                 },
                 "default": "IEC"
             }
diff --git a/src/options/display.h b/src/options/display.h
index ef3c21971..f96f304be 100644
--- a/src/options/display.h
+++ b/src/options/display.h
@@ -5,8 +5,8 @@
 typedef enum __attribute__((__packed__)) FFSizeBinaryPrefixType
 {
     FF_SIZE_BINARY_PREFIX_TYPE_IEC,   // 1024 Bytes = 1 KiB, 1024 KiB = 1 MiB, ... (standard)
-    FF_SIZE_BINARY_PREFIX_TYPE_SI,    // 1000 Bytes = 1 KB, 1000 KB = 1 MB, ...
-    FF_SIZE_BINARY_PREFIX_TYPE_JEDEC, // 1024 Bytes = 1 kB, 1024 kB = 1 MB, ...
+    FF_SIZE_BINARY_PREFIX_TYPE_SI,    // 1000 Bytes = 1 kB, 1000 kB = 1 MB, ...
+    FF_SIZE_BINARY_PREFIX_TYPE_JEDEC, // 1024 Bytes = 1 KB, 1024 KB = 1 MB, ...
 } FFSizeBinaryPrefixType;
 
 typedef enum __attribute__((__packed__)) FFTemperatureUnit